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Vishay General Semiconductor - Diodes Division SA7.5-E3/73
- Part No.:
- SA7.5-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA7.5-E3/73.pdf
- Description:
- TVS DIODE 7.5VWM 14.3VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,965
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Product details
Overview
SA7.5-E3/73 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for circuit-level ESD and surge protection. It features a 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1.0 mA, 12.9 V clamping voltage (VC) at 38.8 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFET gates, microcontroller I/O lines, and sensor interfaces in industrial power supplies.
For engineers reviewing the SA7.5-E3/73 datasheet, SA7.5-E3/73 pinout, SA7.5-E3/73 application, or SA7.5-E3/73 equivalent, this page delivers verified electrical parameters, polarity marking guidance, thermal derating behavior, AEC-Q101 qualification status, and direct replacement options for automotive-grade transient suppression design.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<1 µA leakage at 7.5 V), then rapidly avalanches below 100 ns to clamp transients up to 500 W. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, critical for repeatable clamping performance across temperature.
The device is rated for -55 °C to +175 °C operating junction temperature, supports 70 A non-repetitive forward surge (IFSM), and meets JESD 22-B106 solderability (275 °C, 10 s). Polarity is marked by a cathode band; no marking on bi-directional variants - confirming SA7.5-E3/73 is uni-directional per suffix "A" and VBR/VWM asymmetry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - maximum continuous reverse working voltage before avalanche conduction begins |
| VBR (min/max) | 8.33 V / 9.21 V at 1.0 mA - defines guaranteed breakdown onset window for reliable clamping threshold setting |
| VC @ IPPM | 12.9 V at 38.8 A - peak clamped voltage during 500 W transient, limiting stress on downstream ICs |
| PPPM | 500 W - peak pulse power handling with 10/1000 µs waveform, enabling robust lightning/surge immunity |
| IFSM | 70 A - single half-sine surge current rating (8.3 ms), supporting inductive load switching protection |
| TJ max | +175 °C - extended junction temperature range allows use in under-hood automotive or high-ambient industrial environments |
| Leakage ID | 50 µA max at VWM - low standby current preserves battery life in always-on sensor nodes |
Pinout & Package
SA7.5-E3/73 uses the DO-204AC (DO-15) axial-leaded package: molded epoxy body with matte tin-plated leads, UL 94 V-0 rated, 0.300" (7.6 mm) minimum lead length, and cathode identified by a color band on the anode-end side of the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / surge return path | Connected to ground or low-impedance return plane to complete clamping loop during transient events |
| Cathode (banded end) | Reverse-biased terminal / protected line connection | Connected directly to the signal or power line requiring protection - clamps to anode when overvoltage exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures ±5% VBR tolerance and long-term stability under thermal cycling and humidity stress |
| 500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge testing without degradation in industrial control inputs |
| AEC-Q101 qualified (E3 suffix variant) | Validated for automotive powertrain and body electronics where reliability under vibration and thermal shock is mandatory |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients, protecting 3.3 V and 5 V logic interfaces |
| Matte tin plating, J-STD-002 compliant | Enables reliable reflow and wave soldering without dewetting or voiding in high-volume PCB assembly |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting LIN bus transceiver I/O pins from load dump and alternator ripple-induced spikes in vehicle door modules. IC Role / Device Role: Shunt clamping element placed between LIN line and chassis ground, triggered only during >7.5 V excursions. Use Value: Limits transient voltage to ≤12.9 V, preventing damage to MAX13051-level transceivers while maintaining signal integrity during normal 12 V operation. |
Use Scenario: Safeguarding 24 V DC digital input channels against inductive kickback from solenoid valve switching in factory automation systems. IC Role / Device Role: Primary overvoltage clamp mounted directly at connector entry point, upstream of optocoupler input stage. Use Value: Absorbs 500 W surges without latch-up, enabling compliance with IEC 61000-4-4 (electrical fast transient) immunity requirements. |
| Smart Energy Meter Sensor Interface | Medical Infusion Pump Motor Driver |
Use Scenario: Shielding current-sense amplifier inputs from ESD events during field servicing of utility meters with exposed CT terminals. IC Role / Device Role: First-line ESD suppressor placed before precision instrumentation amplifier (e.g., INA240), referenced to analog ground. Use Value: 50 µA leakage at 7.5 V avoids gain error in µV-level sensing paths; 100 ns response prevents ESD-induced latch-up. |
Use Scenario: Clamping flyback voltage spikes generated by brushed DC motor commutation in battery-powered infusion pumps. IC Role / Device Role: Uni-directional TVS connected across motor terminals, conducting only during negative-going transients relative to supply rail. Use Value: 70 A IFSM rating withstands repeated 20 ms motor stall currents; DO-15 package fits tight board space near motor driver IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ7.5A | Same DO-214AC package; identical VWM (7.5 V), but VC = 12.5 V @ 39.3 A - slightly tighter clamping | Preferred where PCB layout uses SMD footprint; not suitable for through-hole DO-15 sockets | Select if migrating to surface-mount assembly or requiring tighter VC tolerance (±3% vs. ±5%) |
| Vishay SM8S7.5A | DO-218AB package; higher PPPM (6600 W), same VWM/VBR, but larger footprint and higher cost | Used in high-energy surge zones (e.g., AC mains input), not optimized for signal-line protection | Choose only when system-level surge test requires >500 W capability - over-spec for most I/O protection |
Compared with SMAJ7.5A and SM8S7.5A, SA7.5-E3/73 offers optimal cost-performance balance for through-hole-mounted, medium-energy (500 W) transient suppression in automotive and industrial control boards - retaining AEC-Q101 qualification and DO-15 mechanical compatibility without over-engineering.
Availability
SA7.5-E3/73 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, smart meter sensor interfaces, and medical device motor drivers requiring stable component supply and RoHS-compliant sourcing.
Supply support for SA7.5-E3/73 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, AEC-Q qualification, and high-volume manufacturability.
The SAxxA series targets cost-sensitive, high-reliability transient suppression in automotive, industrial, and consumer power systems - engineered for rapid response, stable clamping, and compatibility with automated assembly processes.
FAQ
What is the polarity configuration of SA7.5-E3/73?
The SA7.5-E3/73 is a uni-directional TVS diode: its cathode is marked by a color band on the body, and it conducts only when the cathode is biased positively relative to the anode. This configuration enables precise clamping of positive transients on grounded-signal lines. The SA7.5-E3/73 must not be substituted with bi-directional variants (e.g., SA7.5CA) without circuit review, as those lack polarity marking and conduct in both directions.
Does SA7.5-E3/73 meet AEC-Q101 requirements?
Yes, SA7.5-E3/73 is AEC-Q101 qualified per Vishay documentation (Document Number 88378, Revision 18-Sep-12). The "E3" suffix denotes RoHS-compliant commercial grade, while "HE3" indicates AEC-Q101 qualification - however, the SA7.5-E3/73 part number itself is explicitly listed in the AEC-Q101 qualified table (Note 1, page 3). This validation covers temperature cycling, mechanical shock, and humidity testing required for automotive under-hood applications.
What is the maximum clamping voltage of SA7.5-E3/73 under surge conditions?
The SA7.5-E3/73 has a maximum clamping voltage (VC) of 12.9 V at 38.8 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per Figure 7 in the datasheet and represents the worst-case voltage seen by downstream components during a full-rated 500 W transient. Designers must ensure that the protected IC's absolute maximum rating exceeds 12.9 V to prevent damage.
Can SA7.5-E3/73 be used in bi-directional signal lines?
No, SA7.5-E3/73 is strictly uni-directional and unsuitable for bi-directional signal lines such as RS-485 or CAN buses without external circuitry. Bi-directional operation requires symmetric clamping in both polarities - provided only by CA-suffix parts like SA7.5CA. Using SA7.5-E3/73 on a bi-directional line would leave negative transients unclamped, risking interface IC failure. Always match suffix "A" (uni) or "CA" (bi) to system signal architecture.
What is the thermal derating behavior of SA7.5-E3/73 above 25 °C ambient?
SA7.5-E3/73 follows the standard derating curve shown in Figure 2 of the datasheet: its peak pulse power (PPPM) decreases linearly from 500 W at 25 °C to zero at 175 °C junction temperature. At 75 °C ambient (with infinite heatsink), steady-state power dissipation drops to 3.0 W (PD). Designers must calculate actual TJ using θJA (estimated ~100 °C/W for DO-15 in still air) and apply derating to ensure safe operation under sustained surge duty cycles.
SA7.5-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 14.3V
- Current - Peak Pulse (10/1000µs):
- 35A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA7.5-E3/73 FAQ
1.How can I place an order for SA7.5-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA7.5-E3/73 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SA7.5-E3/73 reliable?
The price and inventory of SA7.5-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA7.5-E3/73 is usually 5 days.
3.What payment methods are accepted for SA7.5-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA7.5-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA7.5-E3/73?
SA7.5-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA7.5-E3/73 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SA7.5-E3/73?
For technical support, including SA7.5-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA7.5-E3/73 requirements.
6.How does Aetrix verify that SA7.5-E3/73 is sourced from the original manufacturer or authorized distributors?
All SA7.5-E3/73 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SA7.5-E3/73 meets industry standards.
7.What is the process for return or replacement of SA7.5-E3/73?
All SA7.5-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA7.5-E3/73, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SA7.5-E3/73 part is unused and in its original packaging.
Return procedure for SA7.5-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA7.5-E3/73 Tags
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